iOS 8.4 beta reveals complete Music app overhaul

The developer beta version of iOS 8.4, which Apple released today, comes with a totally revamped version of Apple's Music app with a completely redesigned interface.

From Techradar:

These run the gamut. You can add custom images and descriptions to playlists, for example, and there's a new recently added section. There's also a new MiniPlayer that displays what's playing even as you browse your library.And iTunes Radio has been streamlined, perhaps a sign of things to come.The most recent iOS update, iOS 8.3, most notably added greater emoji diversity.